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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Cash and cash equivalents	$ 268,918	$ 187,509
Marketable securities	29,878	37,827
Liabilities:
Deferred payments	95,518	104,742
Recurring
Assets:
Total assets at fair value on a recurring basis	34,012	40,668
Money market funds | Recurring
Assets:
Cash and cash equivalents	4,134	2,841
Tax-exempt municipal securities
Assets:
Marketable securities	18,817	20,289
Tax-exempt municipal securities | Recurring
Assets:
Marketable securities	18,817	20,289
Corporate debt securities
Assets:
Marketable securities	11,061	17,538
Corporate debt securities | Recurring
Assets:
Marketable securities	11,061	17,538
Deferred payments | Recurring
Liabilities:
Deferred payments	658	1,658
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Recurring
Assets:
Total assets at fair value on a recurring basis	4,134	2,841
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Money market funds | Recurring
Assets:
Cash and cash equivalents	4,134	2,841
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Tax-exempt municipal securities | Recurring
Assets:
Marketable securities	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Corporate debt securities | Recurring
Assets:
Marketable securities	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Deferred payments | Recurring
Liabilities:
Deferred payments	0	0
Significant Other Observable Inputs (Level 2) | Recurring
Assets:
Total assets at fair value on a recurring basis	29,878	37,827
Significant Other Observable Inputs (Level 2) | Money market funds | Recurring
Assets:
Cash and cash equivalents	0	0
Significant Other Observable Inputs (Level 2) | Tax-exempt municipal securities | Recurring
Assets:
Marketable securities	18,817	20,289
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Recurring
Assets:
Marketable securities	11,061	17,538
Significant Other Observable Inputs (Level 2) | Deferred payments | Recurring
Liabilities:
Deferred payments	0	0
Significant Unobservable Inputs (Level 3) | Recurring
Assets:
Total assets at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Money market funds | Recurring
Assets:
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Tax-exempt municipal securities | Recurring
Assets:
Marketable securities	0	0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Recurring
Assets:
Marketable securities	0	0
Significant Unobservable Inputs (Level 3) | Deferred payments | Recurring
Liabilities:
Deferred payments	$ 658	$ 1,658

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